Outgoing settings:
Trunk name: 210
CID Options: allow any CID
PEER details:
secret=mypassword
dtmfmode=rfc2833
canreinvite=no
context=from-internal
host=dynamic
type=friend
port=5062
qualify=yes
disallow=all
allow=ulaw,g729
Incoming settings:
User context: from-210
secret=mypassword
type=user
context=from-210
In my HT503, in FXO Port:
Primary SIP server: the IP address of my Asterisk box
SIP User ID: 210
Athenticate ID: 210
Authenticate password: mypassword
The rest are typical settings, except:
User ID is phone number: no
Check user ID for incoming INVITE: no
Caller ID transport type: Relay via SIP from